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Tailoring interface epitaxy and magnetism in La1−xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering

Molinari, Alan ; Gorji, Saleh ; Michalička, Jan ; Kübel, Christian ; Hahn, Horst ; Kruk, Robert (2022)
Tailoring interface epitaxy and magnetism in La1−xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering.
In: Journal of Applied Physics, 132 (10)
doi: 10.1063/5.0095406
Article, Bibliographie

Abstract

Defect engineering of La1-xSrxMnO3 (LSMO)-a strongly correlated oxide displaying half metallicity and ferromagnetism above room temperature-has been the focus of a long-standing quest aimed at the exploitation of this material as a functional building block for memory storage and spintronic applications. Here, we discuss the correlation between structural defects and magnetism in La1-xSrxMnO3/SrTiO3 (LSMO/STO) epitaxial heterostructures as a function of growth temperature and post-deposition annealing. Upon increasing the growth temperature from 500 to 700 degrees C at a fixed oxygen partial pressure of 0.007 mbar, the sputter-deposited epitaxial LSMO films experience a progressive increase in Curie temperature T-c from 110 to 270 K and saturation magnetization M-s from 1.4 to 3.3 mu(B)/u.c. owing to a reduction in oxygen deficiencies. Concurrently, however, growth temperatures above 600 degrees C trigger the formation of off-stoichiometric, dendritic-like SrMoOx islands at the film/substrate interface as a possible aftermath of temperature-driven diffusion of impurities from the STO substrate. Notably, although the interfacial spurious islands cause an increase in sample surface roughness, the heterostructure still preserves high-quality epitaxy. In general, the best compromise in terms of both structural and magnetic properties, comprising high-quality epitaxy, atomically flat surface, and robust ferromagnetism above room temperature, is obtained for LSMO films grown at a relatively low temperature of about 500-540 degrees C followed by a post-deposition annealing treatment at 900 degrees C for 1 h in air. Our study compares effective routes based on temperature-controlled defect engineering to finely tailor the complex interplay between microstructure and magnetism in LSMO thin films. (C) 2022 Author(s).

Item Type: Article
Erschienen: 2022
Creators: Molinari, Alan ; Gorji, Saleh ; Michalička, Jan ; Kübel, Christian ; Hahn, Horst ; Kruk, Robert
Type of entry: Bibliographie
Title: Tailoring interface epitaxy and magnetism in La1−xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering
Language: English
Date: 14 September 2022
Publisher: AIP Publishing
Journal or Publication Title: Journal of Applied Physics
Volume of the journal: 132
Issue Number: 10
DOI: 10.1063/5.0095406
Abstract:

Defect engineering of La1-xSrxMnO3 (LSMO)-a strongly correlated oxide displaying half metallicity and ferromagnetism above room temperature-has been the focus of a long-standing quest aimed at the exploitation of this material as a functional building block for memory storage and spintronic applications. Here, we discuss the correlation between structural defects and magnetism in La1-xSrxMnO3/SrTiO3 (LSMO/STO) epitaxial heterostructures as a function of growth temperature and post-deposition annealing. Upon increasing the growth temperature from 500 to 700 degrees C at a fixed oxygen partial pressure of 0.007 mbar, the sputter-deposited epitaxial LSMO films experience a progressive increase in Curie temperature T-c from 110 to 270 K and saturation magnetization M-s from 1.4 to 3.3 mu(B)/u.c. owing to a reduction in oxygen deficiencies. Concurrently, however, growth temperatures above 600 degrees C trigger the formation of off-stoichiometric, dendritic-like SrMoOx islands at the film/substrate interface as a possible aftermath of temperature-driven diffusion of impurities from the STO substrate. Notably, although the interfacial spurious islands cause an increase in sample surface roughness, the heterostructure still preserves high-quality epitaxy. In general, the best compromise in terms of both structural and magnetic properties, comprising high-quality epitaxy, atomically flat surface, and robust ferromagnetism above room temperature, is obtained for LSMO films grown at a relatively low temperature of about 500-540 degrees C followed by a post-deposition annealing treatment at 900 degrees C for 1 h in air. Our study compares effective routes based on temperature-controlled defect engineering to finely tailor the complex interplay between microstructure and magnetism in LSMO thin films. (C) 2022 Author(s).

Identification Number: Artikel-ID: 105304
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > In-situ electron microscopy
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 12 Jun 2024 08:49
Last Modified: 12 Jun 2024 12:35
PPN: 519054555
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